乙型肝炎病毒 X 蛋白通过下调 HCC 中的长链非编码 RNA OIP5-AS1/HKDC1 促进肿瘤糖酵解。

Hepatitis B virus X protein promotes tumor glycolysis by downregulating lncRNA OIP5-AS1/HKDC1 in HCC.

机构信息

State Key Laboratory for Diagnosis and Treatment of Infectious Diseases, National Clinical Research Center for Infectious Diseases, Collaborative Innovation Center for Diagnosis and Treatment of Infectious Diseases, The First Affiliated Hospital, College of Medicine, Zhejiang University, Hangzhou, Zhejiang 310000, PR China.

Department of Ultrasound, The First Affiliated Hospital, College of Medicine, Zhejiang University, Hangzhou, Zhejiang 310000, PR China.

出版信息

Cell Signal. 2024 Jul;119:111183. doi: 10.1016/j.cellsig.2024.111183. Epub 2024 Apr 16.

Abstract

Hepatocellular carcinoma (HCC) is one of the leading causes of cancer-related mortality worldwide, with Hepatitis B virus (HBV) infection being the leading cause. This study aims to investigate the role of HBV in HCC pathogenesis involving glucose metabolism. Long non-coding RNA (lncRNA) OIP5-AS1 was significantly downregulated in HBV-positive HCC patients, and its low expression indicated a poor prognosis. This lncRNA was primarily localized in the cytoplasm, acting as a tumor suppressor. HBV protein X (HBx) repressed OIP5-AS1 expression by inhibiting a ligand-activated transcriptional factor peroxisome proliferator-activated receptor α (PPARα). Furthermore, mechanistic studies revealed that OIP5-AS1 inhibited tumor growth by suppressing Hexokinase domain component 1 (HKDC1)-mediated glycolysis. The expression of HKDC1 could be enhanced by transcriptional factor sterol regulatory element-binding protein 1 (SREBP1). OIP5-AS1 facilitated the ubiquitination and degradation of SREBP1 to suppress HKDC1 transcription, which inhibited glycolysis. The results suggest that lncRNA OIP5-AS1 plays an anti-oncogenic role in HBV-positive HCC via the HBx/OIP5-AS1/HKDC1 axis, providing a promising diagnostic marker and therapeutic target for HBV-positive HCC patients.

摘要

肝细胞癌(HCC)是全球癌症相关死亡的主要原因之一,其中乙型肝炎病毒(HBV)感染是主要原因。本研究旨在探讨 HBV 在涉及葡萄糖代谢的 HCC 发病机制中的作用。长链非编码 RNA(lncRNA)OIP5-AS1 在 HBV 阳性 HCC 患者中显著下调,其低表达表明预后不良。这种 lncRNA 主要定位于细胞质,作为一种肿瘤抑制因子。HBV 蛋白 X(HBx)通过抑制配体激活的转录因子过氧化物酶体增殖物激活受体α(PPARα)来抑制 OIP5-AS1 的表达。此外,机制研究表明,OIP5-AS1 通过抑制己糖激酶结构域成分 1(HKDC1)介导的糖酵解来抑制肿瘤生长。转录因子固醇调节元件结合蛋白 1(SREBP1)可以增强 HKDC1 的表达。OIP5-AS1 促进 SREBP1 的泛素化和降解,从而抑制 HKDC1 的转录,抑制糖酵解。研究结果表明,lncRNA OIP5-AS1 通过 HBx/OIP5-AS1/HKDC1 轴在 HBV 阳性 HCC 中发挥抑癌作用,为 HBV 阳性 HCC 患者提供了有前途的诊断标志物和治疗靶点。

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